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Institute of Cosmic Research. Translated from Astrofizika, Vol. 20, No. 1, pp. 73–83, January–February, 1984.
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Komberg, B.V. On the possible existence of two populations of quasistellar objects. Astrophysics 20, 50–56 (1984). https://doi.org/10.1007/BF01005900
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DOI: https://doi.org/10.1007/BF01005900